This is a new aftermarket Stens piston for a 8hp Kohler engine. It is a standerd piston at .010 over. This Stens part number is 515-130 (no longer available) The Kohler number for this part is 41 874 07 or 41 874 07-S. It fits kohler engines, K181 (30100-30848) and M8 (301500-301627). Included is the piston and the piston pin ( piston rings and retaining clips are NOT included) (2J-1)